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p{max-width:420px;margin:0;color:#ffffffc7;font-size:.875rem;line-height:1.5}.video-loading-overlay.has-error{pointer-events:auto}.video-loading-spinner{width:42px;height:42px;border:4px solid rgba(255,255,255,.24);border-top-color:var(--green);border-radius:50%;animation:video-loading-spin .85s linear infinite}@keyframes video-loading-spin{to{transform:rotate(360deg)}}.custom-controls{position:absolute;bottom:0;left:0;right:0;background:linear-gradient(to top,rgba(0,0,0,.9),transparent);padding:40px 20px 16px;display:flex;flex-direction:column;gap:12px;opacity:0;transition:opacity .3s ease;pointer-events:none;z-index:4}.custom-video-wrapper:hover .custom-controls,.custom-controls:hover{opacity:1;pointer-events:auto}.controls-progress{width:100%;height:6px;background:#fff3;border-radius:3px;cursor:pointer;position:relative;transition:height .1s 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var(--green)}.notif-icon{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;color:#fff}.bg-course{background:var(--green)}.bg-reminder{background:#f39c12}.bg-achievement{background:#9b59b6}.bg-system{background:var(--navy)}.notif-header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}.notif-header-row h4{font-size:1rem;color:var(--navy);margin:0;font-weight:700}.notif-content p{font-size:.9rem;color:var(--text-color);margin:0;line-height:1.4}.notif-dot{width:10px;height:10px;border-radius:50%;background:var(--green);position:absolute;top:16px;right:16px}@media (max-width: 640px){.notif-card{padding:16px 12px}.notif-header-row{flex-direction:column;align-items:flex-start;gap:4px;margin-bottom:8px}}.report-container{max-width:800px;margin:0 auto;padding:0 16px 80px}.page-subtitle{color:var(--text-light);font-size:.95rem;margin-top:4px}.report-stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:32px}.report-stat-card{background:var(--card-bg);border-radius:var(--radius-md);padding:24px 20px;display:flex;align-items:center;gap:16px;box-shadow:var(--shadow-sm)}.stat-icon-wrapper{width:48px;height:48px;border-radius:12px;background:#43d5741a;color:var(--green);display:flex;align-items:center;justify-content:center;flex-shrink:0}.stat-info{display:flex;flex-direction:column}.stat-value{font-size:1.6rem;font-weight:700;color:var(--navy);line-height:1.2}.stat-label{font-size:.85rem;color:var(--text-light);font-weight:500}.report-grid{display:grid;grid-template-columns:1fr;gap:24px}.report-card{background:var(--card-bg);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow-sm)}.report-card-title{font-size:1.1rem;color:var(--navy);margin-bottom:24px;font-weight:700}.subject-list{display:flex;flex-direction:column;gap:20px}.subject-item{display:flex;flex-direction:column;gap:8px}.subject-header{display:flex;justify-content:space-between;align-items:center}.subject-name{font-size:.95rem;font-weight:600;color:var(--text-color)}.subject-score{font-size:.9rem;font-weight:700;color:var(--navy)}.progress-track{height:8px;background:var(--border-light);border-radius:4px;overflow:hidden}.progress-fill{height:100%;border-radius:4px;transition:width 1s ease-out}.activity-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:16px}.activity-item{display:flex;align-items:flex-start;gap:16px;padding-bottom:16px;border-bottom:1px solid rgba(0,0,0,.05)}.activity-item:last-child{border-bottom:none;padding-bottom:0}.activity-icon{width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}.activity-icon.type-video{background:var(--green)}.activity-icon.type-quiz{background:#f39c12}.activity-details{display:flex;flex-direction:column;gap:4px}.activity-title{margin:0;font-size:.95rem;color:var(--text-color);font-weight:500}.activity-date{font-size:.8rem;color:var(--text-light)}@media (max-width: 768px){.report-stats-grid{grid-template-columns:1fr;gap:16px}}.quiz-container{max-width:700px;margin:0 auto;padding:0 16px 80px}.quiz-start-screen{background:var(--card-bg);border-radius:var(--radius-lg);padding:40px 24px;text-align:center;box-shadow:var(--shadow-sm)}.quiz-icon-wrapper{width:80px;height:80px;background:#43d5741a;color:var(--green);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 24px}.quiz-start-screen h2{color:var(--navy);margin-bottom:12px}.quiz-start-screen p{color:var(--text-color);font-size:1.05rem;margin-bottom:24px}.quiz-rules{list-style:none;margin:0 auto 32px;display:inline-block;text-align:left;background:#f8fafc;padding:16px 32px;border-radius:var(--radius-md)}.quiz-rules li{margin-bottom:8px;font-weight:500;color:var(--navy)}.quiz-top-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.quiz-progress{font-weight:600;color:var(--navy)}.quiz-timer{display:flex;align-items:center;gap:6px;background:var(--card-bg);padding:6px 12px;border-radius:16px;font-weight:700;color:var(--navy);box-shadow:var(--shadow-sm)}.quiz-timer.danger{color:var(--error)}.quiz-progress-track{height:6px;background:var(--border-light);border-radius:3px;margin-bottom:24px;overflow:hidden}.quiz-progress-fill{height:100%;background:var(--green);transition:width .3s ease}.quiz-question-card{background:var(--card-bg);border-radius:var(--radius-lg);padding:32px 24px;box-shadow:var(--shadow-sm);margin-bottom:24px}.quiz-question-text{font-size:1.25rem;color:var(--navy);margin-bottom:24px;line-height:1.4}.quiz-options{display:flex;flex-direction:column;gap:12px}.quiz-option-btn{display:flex;align-items:center;gap:16px;width:100%;padding:16px;background:#fff;border:2px solid var(--border-light);border-radius:var(--radius-md);cursor:pointer;text-align:left;transition:all .2s}.quiz-option-btn:hover{border-color:#43d57466;background:#f8fafc}.quiz-option-btn.selected{border-color:var(--green);background:#43d5740d}.option-letter{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:#f1f5f9;border-radius:50%;font-weight:700;color:var(--navy)}.quiz-option-btn.selected .option-letter{background:var(--green);color:#fff}.option-text{font-size:1rem;color:var(--text-color);font-weight:500}.quiz-actions{display:flex;justify-content:space-between}.submit-btn{background:var(--error);color:#fff}.submit-btn:hover{background:#c0392b}.quiz-results-screen{background:var(--card-bg);border-radius:var(--radius-lg);padding:40px 24px;text-align:center;box-shadow:var(--shadow-sm)}.quiz-results-screen h2{color:var(--navy);margin-bottom:8px}.score-circle-wrapper{margin:32px 0;display:flex;justify-content:center}.score-circle{width:160px;height:160px;border-radius:50%;background:#43d5741a;border:8px solid var(--green);display:flex;flex-direction:column;align-items:center;justify-content:center}.score-number{font-size:3.5rem;font-weight:800;color:var(--navy);line-height:1}.score-total{font-size:1.2rem;color:var(--text-light);font-weight:600}.score-message{font-size:1.1rem;color:var(--text-color);margin-bottom:32px}.results-actions{display:flex;gap:16px;justify-content:center}@media (max-width: 640px){.results-actions{flex-direction:column}}.sidebar{display:flex;flex-direction:column}.sidebar-nav{flex:1}.sidebar-footer{margin-top:auto;padding:24px;border-top:1px solid rgba(255,255,255,.05)}.sidebar-profile{display:flex;align-items:center;gap:12px;margin-bottom:16px}.sidebar-avatar{width:40px;height:40px;border-radius:50%;background:var(--green);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:1.2rem;flex-shrink:0}.sidebar-user-info{display:flex;flex-direction:column;overflow:hidden}.sidebar-user-name{color:#fff;font-weight:600;font-size:.95rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.sidebar-user-level{color:var(--text-light);font-size:.8rem}.sidebar-logout{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;background:#ef44441a;color:#ef4444;border:none;padding:10px;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all .2s}.sidebar-logout:hover{background:#ef444433}.notif-header{margin-bottom:24px}.notif-badge{background:var(--green);color:#fff;font-size:.8rem;font-weight:700;padding:2px 8px;border-radius:12px;margin-left:12px;vertical-align:middle}.mark-read-btn{background:none;border:none;color:var(--green);font-weight:600;font-size:.9rem;cursor:pointer}.mark-read-btn:hover{text-decoration:underline}.notifications-container{max-width:800px;margin:0 auto;padding:0 16px 40px}.notif-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:16px}.notif-card{display:flex;align-items:flex-start;gap:16px;background:var(--card-bg);padding:20px;border-radius:var(--radius-md);border:1px solid var(--border-light);cursor:pointer;transition:all .2s ease;position:relative}.notif-card:hover{box-shadow:0 4px 12px #0000000d;transform:translateY(-2px)}.notif-card.unread{background:#fff;border-left:4px solid var(--green)}.notif-card.read{opacity:.8;background:#fafafa}.notif-icon{width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;flex-shrink:0}.notif-icon.bg-course{background:#6c5ce7}.notif-icon.bg-reminder{background:#f39c12}.notif-icon.bg-achievement{background:var(--green)}.notif-icon.bg-system{background:var(--navy)}.notif-content{flex:1}.notif-header-row{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}.notif-header-row h4{margin:0;font-size:1.05rem;color:var(--navy)}.notif-time{font-size:.8rem;color:var(--text-light)}.notif-content p{margin:0;font-size:.95rem;color:var(--text-color);line-height:1.5}.notif-dot{width:10px;height:10px;border-radius:50%;background:var(--green);position:absolute;top:24px;right:20px}.empty-state{text-align:center;padding:60px 20px;background:var(--card-bg);border-radius:var(--radius-md);border:1px solid var(--border-light)}.empty-state-icon{color:var(--text-light);margin-bottom:16px}.empty-state h3{color:var(--navy);margin-bottom:8px}.empty-state p{color:var(--text-color)}.avatar-upload-section{display:flex;align-items:center;gap:20px;margin-bottom:24px}.avatar-preview{width:80px;height:80px;border-radius:50%;overflow:hidden;background:var(--navy);display:flex;align-items:center;justify-content:center}.avatar-img-large{width:100%;height:100%;object-fit:cover}.avatar-img-small{width:100%;height:100%;object-fit:cover;border-radius:50%}.avatar-initial-large{color:#fff;font-size:2rem;font-weight:700}.btn-upload{display:inline-block;padding:8px 16px;background:var(--border-light);color:var(--navy);font-weight:600;font-size:.9rem;border-radius:8px;cursor:pointer;transition:background .2s}.btn-upload:hover{background:#cbd5e1}.custom-select-wrapper{position:relative;display:flex;align-items:center}.custom-select{-moz-appearance:none;appearance:none;-webkit-appearance:none;width:100%;padding:14px 48px 14px 16px;background-color:var(--bg-color)!important;border:1px solid var(--border-light)!important;border-radius:10px;font-size:.95rem;font-weight:500;color:var(--navy);cursor:pointer;transition:all .2s}.custom-select:focus{outline:none;border-color:var(--green)!important;box-shadow:0 0 0 4px #43d57426!important}.custom-select-icon{position:absolute;right:16px;pointer-events:none;color:var(--text-light);transition:color .2s}.custom-select:focus+.custom-select-icon{color:var(--green)}.settings-container{display:flex;gap:32px;max-width:1000px;margin-top:24px}.settings-sidebar{width:280px;display:flex;flex-direction:column;gap:8px}.settings-tab{display:flex;align-items:center;gap:12px;padding:16px 20px;background:var(--card-bg);border:1px solid 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label{font-size:.85rem;font-weight:700;color:var(--navy);text-transform:uppercase;letter-spacing:.5px}.settings-form input,.settings-form select{padding:12px 16px;border:1px solid var(--border-light);border-radius:10px;font-size:.95rem;background:var(--bg-color);color:var(--text-color);transition:all .2s}.settings-form input:focus,.settings-form select:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px #43d57426}.settings-form .form-actions{margin-top:12px;padding-top:24px;border-top:1px solid var(--border-light);display:flex;justify-content:flex-end}.settings-form .btn-save{padding:12px 24px;background:var(--green);color:#fff;border:none;border-radius:10px;font-weight:700;font-size:.95rem;cursor:pointer;transition:all .2s;box-shadow:0 4px 12px #43d5744d}.settings-form .btn-save:hover{transform:translateY(-2px);box-shadow:0 6px 16px #43d57466}.settings-alert{padding:12px 16px;border-radius:8px;margin-bottom:24px;font-size:.9rem;font-weight:600}.settings-alert.error{background:#fef2f2;color:#dc2626;border:1px solid #fecaca}.settings-alert.success{background:#f0fdf4;color:#16a34a;border:1px solid #bbf7d0}@media (max-width: 768px){.settings-container{flex-direction:column;gap:20px}.settings-sidebar{width:100%;flex-direction:row;overflow-x:auto;padding-bottom:8px}.settings-tab{flex:1;white-space:nowrap;justify-content:center}.settings-card{padding:24px 20px}}.floating-chat-btn{bottom:24px;right:24px;width:56px;height:56px;border-radius:50%;background:var(--green);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px #43d57466;transition:all .3s ease;z-index:9999;position:fixed}.floating-chat-btn:hover{transform:scale(1.08)}.floating-chat-btn.open{background:var(--navy)}.fc-unread-badge{position:absolute;top:-2px;right:-2px;background:var(--error);color:#fff;font-size:.65rem;font-weight:700;min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 4px;border:2px solid #fff;pointer-events:none}.floating-chat-window{position:fixed;bottom:92px;right:24px;width:370px;height:580px;background:var(--card);border-radius:16px;box-shadow:0 12px 48px #172f4938;display:flex;flex-direction:column;z-index:9998;animation:chatSlideUp .25s ease;overflow:hidden}@keyframes chatSlideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes chatSlideDown{0%{opacity:1;transform:translateY(0)}to{opacity:0;transform:translateY(16px)}}.fc-closing{animation:chatSlideDown .22s ease forwards}.fc-hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy-light) 100%);color:#fff;padding:20px 20px 28px;flex-shrink:0;position:relative}.fc-hero-close{position:absolute;top:14px;right:14px;background:#ffffff1f;border:none;border-radius:50%;width:30px;height:30px;display:flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;transition:background .2s}.fc-hero-close:hover{background:#ffffff38}.fc-hero-brand{display:flex;align-items:center;gap:10px;margin-bottom:20px}.fc-hero-logo{width:34px;height:34px;border-radius:10px;background:var(--green);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1rem;color:#fff}.fc-hero-brand span{font-weight:700;font-size:1rem;letter-spacing:-.2px}.fc-hero-title{margin:0;font-size:1.35rem;font-weight:800;line-height:1.3;letter-spacing:-.3px}.fc-home-body{flex:1;overflow-y:auto;padding:16px;background:var(--bg);scrollbar-width:none;min-height:0}.fc-home-body::-webkit-scrollbar{display:none}.fc-bottom-nav{display:flex;border-top:1px solid var(--border-light);background:var(--card);flex-shrink:0}.fc-faq-card{background:var(--card);border-radius:12px;border:1px solid var(--border-light);overflow:hidden}.fc-search-wrap{display:flex;align-items:center;gap:10px;padding:12px 16px;border-bottom:1px solid var(--border-light)}.fc-search-input{flex:1;border:none;outline:none;font-size:.875rem;font-family:inherit;color:var(--text-dark);background:transparent}.fc-search-input::placeholder{color:var(--text-light)}.fc-faq-list-new{display:flex;flex-direction:column}.fc-faq-item-new{border-bottom:1px solid var(--border-light)}.fc-faq-item-new:last-child{border-bottom:none}.fc-faq-row-btn{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;background:none;border:none;padding:13px 16px;font-size:.875rem;font-weight:500;color:var(--text-dark);cursor:pointer;text-align:left;transition:background .15s}.fc-faq-row-btn:hover{background:var(--bg)}.fc-faq-answer-new{padding:4px 16px 14px;font-size:.82rem;line-height:1.6;color:var(--text-muted);background:var(--bg);border-top:1px solid var(--border-light)}.fc-team-row{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:14px 16px;background:none;border:none;border-top:1px solid var(--border-light);cursor:pointer;font-size:.82rem;color:var(--text-muted);text-align:left;transition:background .15s}.fc-team-row:hover{background:var(--bg)}.fc-team-avatars{display:flex}.fc-team-av{width:26px;height:26px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.7rem;font-weight:700;color:#fff;border:2px solid #fff;margin-left:-6px}.fc-team-av:first-child{margin-left:0}.fc-bottom-btn{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;padding:10px 8px;border:none;background:none;font-size:.72rem;font-weight:600;color:var(--text-light);cursor:pointer;transition:color .2s;position:relative}.fc-bottom-btn:hover{color:var(--navy)}.fc-bottom-btn.active{color:var(--green)}.fc-tab-badge{background:var(--error);color:#fff;font-size:.6rem;font-weight:700;min-width:16px;height:16px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;padding:0 3px;position:absolute;top:4px;right:calc(50% - 18px)}.fc-msg-header{display:flex;align-items:center;gap:10px;padding:12px 14px;background:linear-gradient(135deg,var(--navy),var(--navy-light));color:#fff;flex-shrink:0}.fc-msg-back{background:#ffffff1f;border:none;border-radius:50%;width:30px;height:30px;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;transition:background .2s}.fc-msg-back:hover{background:#ffffff38}.fc-header-info{display:flex;align-items:center;gap:10px;flex:1}.fc-avatar{width:34px;height:34px;border-radius:50%;background:var(--green);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.95rem;color:#fff;flex-shrink:0}.fc-header-info h4{margin:0;font-size:.9rem;font-weight:700}.fc-status{font-size:.7rem;opacity:.8}.fc-close{background:#ffffff1f;border:none;border-radius:50%;width:28px;height:28px;display:flex;align-items:center;justify-content:center;color:#fff;cursor:pointer;flex-shrink:0;transition:background .2s}.fc-close:hover{background:#ffffff38}.fc-body{flex:1;min-height:0}.fc-messages-scroll{overflow-y:auto;padding:16px;display:flex;flex-direction:column;flex:1;min-height:0}.fc-empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;text-align:center;color:var(--text-light);padding:40px 20px}.fc-empty p{margin:0;font-size:.875rem}.fc-thread{display:flex;flex-direction:column;gap:14px}.fc-msg-row{display:flex;align-items:flex-end;gap:8px}.fc-msg-row.fc-msg-right{flex-direction:row-reverse}.fc-msg-row.fc-msg-left{flex-direction:row}.fc-msg-group{display:flex;flex-direction:column;max-width:75%;gap:4px}.fc-msg-group.align-end{align-items:flex-end}.fc-msg-group.align-start{align-items:flex-start}.fc-msg-avatar{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:700;flex-shrink:0;overflow:hidden}.fc-msg-avatar-admin{background:var(--green);color:#fff}.fc-msg-avatar-student{background:var(--navy);color:#fff}.fc-bubble-new{padding:9px 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